US20060199739A1 - Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same - Google Patents

Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same Download PDF

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Publication number
US20060199739A1
US20060199739A1 US11/071,398 US7139805A US2006199739A1 US 20060199739 A1 US20060199739 A1 US 20060199739A1 US 7139805 A US7139805 A US 7139805A US 2006199739 A1 US2006199739 A1 US 2006199739A1
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United States
Prior art keywords
herbicide
composition
formulation
emulsifying agent
herbicidally active
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Abandoned
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US11/071,398
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English (en)
Inventor
Olav Messerschmidt
Joseph Jankauskas
Frank Smith
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Avenger Products LLC
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Cutting Edge Formulations Inc
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Priority to US11/071,398 priority Critical patent/US20060199739A1/en
Assigned to CUTTING EDGE FORMULATIONS, INC. reassignment CUTTING EDGE FORMULATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JANKAUSKAS, JOSEPH, MESSERSCHMIDT, OLAV, SMITH, FRANK
Priority to PCT/US2006/007426 priority patent/WO2006094126A2/en
Priority to DK06736701.1T priority patent/DK1855527T3/en
Priority to EP17001360.1A priority patent/EP3266304A1/en
Priority to EP06736701.1A priority patent/EP1855527B1/en
Priority to MX2007010700A priority patent/MX2007010700A/es
Priority to LTEP06736701.1T priority patent/LT1855527T/lt
Priority to CA2600605A priority patent/CA2600605C/en
Priority to PT67367011T priority patent/PT1855527T/pt
Priority to SI200632210T priority patent/SI1855527T1/sl
Priority to HUE06736701A priority patent/HUE038053T2/hu
Priority to ES06736701.1T priority patent/ES2643894T3/es
Priority to JP2007558219A priority patent/JP5385534B2/ja
Priority to PL06736701T priority patent/PL1855527T3/pl
Publication of US20060199739A1 publication Critical patent/US20060199739A1/en
Priority to US11/556,287 priority patent/US8153561B2/en
Priority to US11/733,572 priority patent/US20080004183A1/en
Priority to CR9360A priority patent/CR9360A/es
Priority to US12/776,610 priority patent/US8273687B2/en
Assigned to AVENGER PRODUCTS, LLC reassignment AVENGER PRODUCTS, LLC NUNC PRO TUNC ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: CUTTING EDGE FORMULATIONS, INC.
Priority to CY20171101080T priority patent/CY1119467T1/el
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N27/00—Biocides, pest repellants or attractants, or plant growth regulators containing hydrocarbons

Definitions

  • This invention relates to improvements in the field of herbicidal treatment of plants.
  • the invention involves a method of herbicidal treatment of plants whereby unwanted plants and grasses are terminated using a formulation that is highly effective to non-selectively kill plants it contacts. More particularly, the invention relates to “knock-down” herbicide formulations that comprise a herbicidally active limonene component.
  • limonene is a naturally occurring chemical found in high concentrations in citrus fruits and spices.
  • Limonene otherwise known as orange limonene or 1-methyl-4-(1-methylethenyl)cyclohexene or 4-isopropenyl-1-methyl cyclohexene, occurs naturally in various ethereal oils, particularly oils of lemon, orange, lime, grapefruit, caraway, dill and bergamot. It has a chemical formula of C 10 H 16 , a molecular weight of 136.2, and contains 88.1% Carbon and 11.8% Hydrogen by weight.
  • the d-form of limonene is a liquid having a boiling point of 175.5-176 degrees centigrade.
  • Some limonene is prepared by extraction from plants of the mint family, a large quantity is obtained from citrus oils, which are typically 80-90% limonene, and some is obtained from pine oil.
  • citrus oils which are typically 80-90% limonene, and some is obtained from pine oil.
  • d-limonene can be obtained from steam extraction of citrus peels of orange, lemon, lime, grapefruit and bergamot. Some of the extractions can contain as high as 90% d-limonene; however, to produce technical grades of d-limonene of higher purity, i.e., greater than about 95%, distillation of the oils is required.
  • d-Limonene can also be synthesized chemically. d-Limonene has a pleasant citrus scent and it can be suitably used in any living environment.
  • d-limonene has also been used in household and industrial cleaning products. It is readily available from commercial sources such as Florida Chemical Company, Inc., and is available in three different grades, named untreated/technical grade, food grade and lemon-lime grade.
  • the food grade comprises about 97% d-limonene, the untreated/technical grade about 95%, and the lemon-lime grade about 70%, the balance in each case being other terpene hydrocarbons and oxygenated compounds.
  • Limonene has become a valuable industrial chemical. It finds use as a solvent and cleaning agent (in the manufacture of synthetic pine oil), as an expectorant, as a wetting and dispersing agent, as a monomer in the manufacture of various polymeric resins, as a flavorant in many food products and a precursor in the synthesis of the flavorant carvone, and as a polymerization inhibitor in storage of the tetrafluoroethylene monomer used in the manufacture of polytetrafluoroethylene (PTFE). It is also used in many soaps and perfumes for its lemon-like flavor and odor.
  • limonene is a registered active ingredient in at least 15 pesticide products used as insecticides, insect repellents, and dog and cat repellents.
  • pesticide products containing limonene are used for flea and tick control on pets, as an insecticide spray, an outdoor dog and cat repellent, a fly repellent tablecloth, a mosquito larvicide, and an insect repellent for use on humans.
  • Limonene is of relatively low acute toxicity taken orally.
  • the U.S. Food and Drug Administration considers limonene Generally Recognized as Safe (GRAS) as a food additive or flavoring, and as a fragrance additive.
  • GRAS limonene Generally Recognized as Safe
  • the U.S. Environmental Protection Agency has granted limonene an exemption from the requirement of a tolerance when it is used as an inert ingredient in pesticide formulations, and when used as an insect repellent tablecloth.
  • herbicides a wide range of chemicals are used to control weeds in the agricultural industry and to control unwanted vegetation in the landscaping industry.
  • the aim of herbicides is to prevent weeds and unwanted plants from competing with a desired crop in the case of agricultural uses, or competing with preferred vegetation in landscaping applications.
  • herbicidal chemicals that are used in connection with terrestrial plants, which is the subject of the present invention.
  • the herbicides are generally separated into those that have a “contact” action upon plants, and those that have a “systemic” action upon plants.
  • Some herbicides have both a contact and systemic action on plants.
  • Other types of herbicides act in other ways, such as, for example as soil sterilants.
  • Herbicides may either be selective or non-selective.
  • Selective herbicides for example “Treflan” (trifluralin) may be utilized for the selective destruction of certain types of grass.
  • Non-selective herbicides such as “Roundup” (glyphosate) may be used as a general herbicide for destroying or controlling many different types of plants and grasses.
  • herbicides have deleterious effects. For example, they may poison beneficial crops, affect other plants or animals, and/or poison the soil.
  • many herbicidal compositions presently on the market are highly toxic to humans and domestic animals. Most chemical herbicides are dangerous to civilization and are therefore dangerous when accidentally inhaled and/or absorbed into human and animal tissue. Because of the widespread concern of the deleterious side effects of currently available herbicides, and the problems associated with absorption and ingestion into other living matter, there is much concern as to the long-term use of complex and highly dangerous chemicals, especially when they enter into the food chain. A herbicide having lower toxicity is desirable.
  • the present invention provides a method for killing, controlling or suppressing a plant by spraying onto one or more leaves of the plant a liquid herbicidal composition including water, a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5.
  • limonene is acidic and when dissolved in water will lower the pH typically to range of about 4 to 5.
  • the invention provides a method for making a herbicide composition, the method including: (1) providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; (2) diluting the formulation with water to provide a herbicide composition; and (3) mixing into the herbicide composition a pH modifier effective to provide a pH greater than 5.
  • the pH modifier can be provided in the formulation with the herbicidally active limonene component and emulsifying agent, or can be dissolved or dispersed in the water prior to dilution of the formulation.
  • kits for non-selective burn down of plants includes a container having therein a liquid herbicide, the herbicide including water, a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for applying the herbicide to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • kits for non-selective burn down of plants including a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for diluting the formulation to provide a herbicide composition. Also recorded in the medium in some embodiments are instructions for applying the herbicide composition to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • the invention provides a kit for non-selective burn down of plants that includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; and instructions, recorded in a medium, for diluting the formulation with water and adding a pH modifier effective to provide a pH greater than 5. Also recorded in the medium in some embodiments are instructions for applying the herbicide composition to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • the invention provides a “knock-down” herbicidal composition effective against mature weeds including water, a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5.
  • a method for killing, controlling or suppressing a plant which includes providing a liquid herbicidal composition including water, a herbicidally active limonene component, an emulsifying agent and a wetting agent; and spraying the herbicidal composition onto one or more leaves of the plant.
  • the invention also provides a method for making a herbicide composition that includes: (1) providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; (2) diluting the formulation with water to provide a herbicide composition; and (3) mixing into the herbicide composition a wetting agent.
  • a kit for non-selective burn down of plants that includes a container having therein a liquid herbicide, the herbicide including water, a herbicidally active limonene component, an emulsifying agent and a wetting agent; and instructions, recorded in a medium, for applying the herbicide to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • a kit for non-selective burn down of plants that includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; and instructions, recorded in a medium, for diluting the formulation and mixing in a wetting agent to provide a herbicide composition. Also recorded in the medium in some embodiments are instructions for applying the herbicide composition to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • a “knock-down” herbicidal composition effective against mature weeds including water, a herbicidally active limonene component, an emulsifying agent and a wetting agent.
  • a method for killing, controlling or suppressing a plant including: (1) providing a liquid herbicidal composition including water, a herbicidally active limonene component, an emulsifying agent, a wetting agent and a pH modifier effective to provide a pH greater than 5; and (2) spraying the herbicidal composition onto one or more leaves of the plant.
  • a method for making a herbicide composition that includes: (1) providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; (2) diluting the formulation with water to provide a herbicide composition; and (3) mixing into the herbicide composition a wetting agent and a pH modifier effective to provide a pH greater than 5.
  • the invention also provides a method for making a herbicide composition, the method including: (1) providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5; (2) diluting the formulation with water to provide a herbicide composition; and (3) mixing into the herbicide composition a wetting agent.
  • a kit for non-selective burn down of plants that includes a container having therein a liquid herbicide, the herbicide including water, a herbicidally active limonene component, an emulsifying agent, a wetting agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for applying the herbicide to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • Another kit for non-selective burn down of plants includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for diluting the formulation and adding a wetting agent to provide a herbicide composition. Also recorded in the medium in some embodiments are instructions for applying the herbicide composition to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • Still another kit for non-selective burn down of plants includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; and instructions, recorded in a medium, for diluting the formulation with water and adding a wetting agent and a pH modifier effective to provide a pH greater than 5. Also recorded in the medium in some embodiments are instructions for applying the herbicide composition to a pre-selected area for indiscriminately killing, controlling or suppressing plants growing in the area.
  • a “knock-down” herbicidal composition effective against mature weeds including water, a herbicidally active limonene component, an emulsifying agent, a wetting agent and a pH modifier effective to provide a pH greater than 5.
  • FIG. 1 is a bar graph setting forth the wilting assessment results at 2 and 24 hours from a field study of common grasses and broadleaves in turf conducted in November of 2004. Statistical analysis is by Duncan's MRT (P ⁇ 0.05). Treatments with the same letter or letter combination are not significantly different.
  • FIG. 2 is a bar graph setting forth the wilting assessment results at 2 and 7 days from a field study of common grasses and broadleaves in turf conducted in November of 2004. Statistical analysis is by Duncan's MRT (P ⁇ 0.05). Treatments with the same letter or letter combination are not significantly different.
  • FIG. 3 sets forth a plot of the data presented in FIGS. 1 and 2 .
  • FIG. 4 is a bar graph setting forth the color assessment results at 2 and 24 hours from a field study of common grasses and broadleaves in turf conducted in November of 2004. Statistical analysis is by Duncan's MRT (P ⁇ 0.05). Treatments with the same letter or letter combination are not significantly different.
  • FIG. 5 is a bar graph setting forth the color assessment results at 2 and 7 days from a field study of common grasses and broadleaves in turf conducted in November of 2004. Statistical analysis is by Duncan's MRT (P ⁇ 0.05). Treatments with the same letter or letter combination are not significantly different.
  • FIG. 6 sets forth a plot of the data presented in FIGS. 4 and 5 .
  • FIG. 7 is a bar graph setting forth results from a field study on lambsquarters conducted in Florida in January of 2005. Ratings are based on 0 to 10 (no damage to dead). Statistical analysis is by Duncan's MRT (P ⁇ 0.05). Treatments with the same letter or letter combination are not significantly different.
  • FIG. 8 is a bar graph setting forth results from a greenhouse study on lambsquarters conducted in Michigan in January of 2005. Ratings are based on 0 to 100% (no damage to dead). Statistical analysis is by Duncan's MRT (P ⁇ 0.05). Treatments with the same letter or letter combination are not significantly different.
  • this invention provides in one embodiment a method of killing, controlling or suppressing a plant by administering to surfaces of the plant a herbicide composition comprising a herbicidally effective limonene component and an emulsifying agent in an aqueous emulsion, wherein the composition has a pH greater than 5.
  • the invention provides a method of killing, controlling or suppressing a plant by administering to surfaces of the plant a herbicide composition comprising a herbicidally effective limonene component and an emulsifying agent in an aqueous emulsion, wherein the composition includes a wetting agent.
  • a method of killing, controlling or suppressing a plant by administering to surfaces of the plant a herbicide composition comprising a herbicidally effective limonene component and an emulsifying agent in an aqueous emulsion, wherein the composition has a pH greater than 5 and includes a wetting agent.
  • the term “herbicidal” or “herbicidally effective” refers to the quality of being effective to kill, control or suppress a plant when at least a minimum amount of the herbicide composition contacts the plant.
  • the term “kill” as used herein in relation to a herbicide means to cause the above-ground portion of a plant to irreversibly cease normal function, typically resulting in wilting and browning and/or necrosis of the normally green tissues of the plant. It is, of course, possible that a plant, particularly a perennial plant, that is killed within this meaning may “re-sprout” and produce new growth.
  • control as used herein in relation to a herbicide means that, in a treated area, the plants experience at least about 90% mortality.
  • % mortality can refer to a percentage of individual plants in the treatment area that are killed, or a percentage of the total mass or total surface area of vegetation in the treatment area that experiences wilting, bleaching, browning or necrosis.
  • suppress is used herein in relation to a herbicide to mean that, in a treatment area, the plants experience from about 40 to about 90% mortality.
  • Application of an inventive herbicide composition to the plant causes the plant, where contacted, to wilt, bleach, or brown, which results in necrosis of the leaf (“burn down”) and oftentimes death of the plant.
  • Herbicide compositions in accordance with many preferred embodiments of the present invention are non-selective and non-systemic, and are effective against almost any vegetation, specifically against common crop and garden weeds, both annual and perennial. They are “contact herbicides” in that their action results from contact with plant surfaces rather than uptake by the plant.
  • inventive formulations are “knock-down” (i.e. fast acting, typically within several hours) or “burn down” herbicides, which must be sprayed over a substantial portion of the above-ground part of the plant in order to have an optimal or desired effect.
  • the herbicides are applied as a fine droplet spray.
  • inventive herbicides have optimal burn down effect in relatively warm temperatures and relatively dry conditions (relative to average temperatures and moisture for a given location).
  • the active ingredient of the present herbicidal compositions has the advantage of being an environmentally friendly, natural product, which is unlikely to cause environmental pollution or create toxicity problems for humans or domestic animals.
  • the herbicidally active limonene componenet when a thin film of the herbicide composition covers all or a portion of the leaves and other green tissues of a target plant, the herbicidally active limonene componenet, under conditions present in the composition, may break down or dissolve the waxy layers of the plant, thereby causing the plant to lose the ability to prevent the loss of moisture to the environment. Since limonene-containing oils are natural oils, the non-toxic aqueous herbicide compositions of the invention are environmentally acceptable and have little, if any deleterious effect on humans, wildlife and non-target vegetation.
  • herbicide composition is used herein to refer to a liquid that is actually contacted with a plant, such as from a sprayer, to achieve burn down in accordance with the invention.
  • a herbicide composition of the invention can be made and provided to an end user as a pre-made (or “pre-mixed” or “ready to spray”) herbicide composition in some forms of the invention.
  • the herbicide composition can be mixed by the end user at or near the place where the herbicide composition will be used by diluting a herbicide concentrate formulation and optionally adding other ingredients.
  • herbicide formulation and “herbicide concentrate” and “herbicide concentrate formulation” are used interchangeably to refer to a formulation of ingredients in accordance with the invention that can be diluted with water, with the optional addition of other ingredients, to provide a herbicide composition.
  • This manner of providing a herbicide concentrate formulation may be desirable, for example, where vegetation covering a large area is to be sprayed, for example, using commercial spraying equipment, and thus a great volume of the herbicide composition is needed.
  • a herbicide formulation can be provided to an end user, optionally together in a kit, with instructions for mixing the formulation with water, and perhaps other ingredients in or near the sprayer to provide a herbicide composition.
  • Such herbicide formulations and herbicide kits are described further herein, but attention is first given to herbicide compositions of the invention.
  • a non-selective, burn down herbicide composition includes a herbicidally active limonene component, an emulsifying agent and a hydrophilic solvent, preferably water, and that includes a wetting agent, or has a pH greater than 5, or includes a wetting agent and has a pH greater than 5.
  • the herbicidally active limonene component includes limonene or a limonene derivative in sufficient amount that it is effective, when in a herbicide composition provided in accordance with the present invention, to kill, control or suppress plants that are contacted with a sufficient amount of the herbicide composition.
  • a sufficient amount is considered to be an amount contacting a sufficient surface of the plants to achieve a desired result.
  • the herbicidally active limonene component can be a pure or substantially pure limonene or limonene extract, or a multi-component composition that includes limonene.
  • the herbicidally active limonene component can comprise an essential oil that includes limonene, preferably at least about 8% limonene by weight.
  • the limonene can be provided in the form of a citrus oil, a pine oil, a eucalyptus oil or a tea tree oil, any of which can be the herbicidally active limonene component in accordance with the invention.
  • the herbicidally active limonene component can comprise a modified limonene, as long as the modified limonene has herbicidal activity in accordance with the invention.
  • oxygenation of limonene to provide limonene oxide may improve water solubility characteristics while maintaining similar burn-down functionality compared to unmodified limonene.
  • modified limonene compounds are contemplated by the present invention, and are expressly included within the meaning of the term “herbicidally active limonene component.”
  • the herbicidally active limonene component comprises a citrus oil, e.g. orange oil.
  • the herbicidally active limonene component comprises d-limonene derived from a citrus oil.
  • the fraction of the citrus oil comprising d-limonene can be separated off by vacuum distillation, or any other conventional separation process.
  • d-Limonene is volatile, and is separated off in the distillate.
  • the distillate is a highly concentrated composition of the d-limonene, comprising about 95-96% by weight of d-limonene and about 4-5% by weight of other components. This distillate may be utilized in a herbicidal composition of the present invention.
  • vacuum distillation or other separation process, such as steam distillation (azeotroping), solvent extraction, supercritical extraction etc.
  • steam distillation azeotroping
  • solvent extraction a valuable by-product
  • terpenes particularly monoterpenes, that have similar herbicidal properties to limonene in formulations as provided herein are considered equivalent to limonene for purposes of the present invention.
  • other natural oils having high terpene content and having similar herbicidal properties to the limonene-containing oils discussed above in formulations as provided herein are considered equivalent to the limonene-containing oils for purposes of the present invention.
  • “High terpene content” as used herein means those natural oils having a terpene content of at least 50 percent. It is preferable that the natural oil contains at least 90 percent terpene.
  • Such terpenes and terpene containing natural oils are expressly encompassed within the meaning of the term “herbicidally active limonene component” as used herein.
  • the herbicide composition preferably includes from about 8 percent to about 100 percent by weight of the limonene, preferably from about 12 percent to about 30 percent by weight and more preferably from about 15 percent to about 25 percent by weight. It is understood by a person of ordinary skill in the art that a herbicide composition having a lower concentration of limonene can be used to achieve a similar response by spraying a higher volume of the herbicide composition on the plant (increasing the volume increases the amount of limonene to which the plant is exposed).
  • the amount of the natural oil in the herbicide will depend upon the amount of terpenes in the specific oil used.
  • the herbicide composition includes from about 8 percent to about 100 percent by weight of such a natural oil, preferably from about 12 percent to about 30 percent by weight and more preferably from about 15 percent to about 25 percent by weight.
  • the remainder of the herbicide composition comprises water (or optionally another hydrophilic solvent), one or more emulsifying agents, and one or more of a wetting agent and a pH modifier.
  • the emulsifying agent is preferably a non-toxic emulsifying agent, and can be a surfactant or other emulsifying agent known in the art, or a mixture of one or more thereof.
  • the emulsifying agents employed should be capable, when mixed with water and the herbicidally active limonene component, of forming an emulsion, preferably a homogeneous emulsion.
  • Useful emulsifying agents include lauryl dimethyl amine oxide, polyoxypropylene, polyoxyethylene block copolymers alcohol ethoxylate and nonylphenol ethoxylate.
  • the emulsifying agent can be a polyethoxylated castor oil.
  • One such emulsifying agent is available commercially under the trade name of Alkamuls EL620 from Rhone Poulenc Co. It is non-toxic to humans and animals and will not cause skin or eye irritation.
  • Other commercially available emulsifying agents that are non-toxic, such as polyoxyethylenesorbitans supplied by ICI Americas or Sigma Chemical Company, may also be suitably used for the present invention.
  • a polyoxyethylenesorbitan monooleate such as Tween 80 may be used.
  • Surfactants such as anionic and nonionic surfactants are acceptable emulsifying agents for use in a herbicide composition of the present invention.
  • Preferred anionic surfactants include salts of fatty acids, alkyl sulphates, alkyl ether sulphonates and alkyl aryl sulphonates.
  • Preferred nonionic surfactants include silicone based and nonylphenol ethoxylate surfactants. Examples of preferred surfactants include about 10 percent sulfonic acid, about 6 percent to about 7 percent sodium laurel sulfate, from about 8 percent to about 12 percent alcohol ethoxylate and from about 1 percent to about 2 percent olefin sulfonate.
  • the emulsifying agent should be present in an amount sufficient to render the herbicidally active limonene component miscible in the water or other hydrophilic solvent.
  • the herbicide composition will contain from about 0.05 percent to about 10 percent by weight of one or more emulsifying agent, preferably from about 0.1 percent to about 0.5 percent by weight and more preferably from about 0.2 percent to about 0.4 percent by weight.
  • an inventive herbicide composition will typically comprise an emulsion of a herbicidally active limonene component with water
  • an inventive composition can include another non-toxic hydrophilic solvent instead of or in addition to water, such as, for example, ethanol, dilute acetic acid solutions, and the like.
  • the herbicide composition has a pH greater than 5. In another embodiment, the herbicide composition has a pH of from about 5 to about 10.
  • the pH of the naturally acidic limonene can be raised by including a pH modifier in the herbicide composition.
  • pH modifiers that can be selected for use in connection with the invention include, without limitation, potassium carbonate, sodium hydroxide and potassium hydroxide.
  • the pH of the composition can range from about 6 to about 8. In another preferred embodiment, the pH range of the herbicidal composition is from about 8 to about 10.
  • herbicide compositions which are suitable for application as a spray, include about 8% to about 100% w/w %, preferably about 12% to about 30% w/w %, and more preferably from about 15% to about 25% by weight of a herbicidally active limonene component; from about 0.05% to about 10% w/w %, preferably about 0.1% to about 0.5% w/w %, and more preferably from about 0.2% to about 0.4% by weight of an emulsifying agent; a pH modifier in an amount effective to maintain a desired pH in the composition; and the balance of water or other selected hydrophilic solvent.
  • a herbicide composition comprising a herbicidally active limonene component at a concentration of at least about 8% w/w %, an emulsifying agent effective to dissolve or disperse the herbicidally active limonene component in water, in an effective amount, a pH modifier effective to maintain a pH greater than 5, and a hydrophilic solvent, preferably water.
  • the herbicide composition includes a wetting agent effective to improve the wetting properties, and possibly also the penetration properties, of the herbicide composition.
  • a wetting agent included in a herbicide composition of the invention, the composition sprayed on the weeds or other vegetation can be applied at a lower rate (i.e., measured in gallons per acre) to achieve an equivalent result because the wetting agent causes each droplet of the composition to spread over a greater surface area of the plant.
  • a wetting agent is absent, the composition sprayed on a plant must cover a significantly greater surface area of the plant to achieve a similar result.
  • wetting agents suitable for use in herbicides are known to a person of ordinary skill in the art, and are available commercially.
  • wetting agents that can be selected for use in connection with the invention include, without limitation, nonylphenol ethoxlyate, and anionic, cationic and nonionic (including silicone based) surfactants and methylated seed oil.
  • Particularly preferred wetting agents are silicone surfactants.
  • the composition includes from about 0.02% to about 1.0% w/w % of a wetting agent.
  • the herbicide composition includes from about 0.05% to about 0.5% w/w %, more preferably from about 0.1% to about 0.2% w/w %, of a wetting agent.
  • herbicide compositions which are suitable for application as a spray, include about 8% to about 100% w/w %, more preferably about 12% to about 30% w/w %, and more preferably from about 15% to about 25% by weight of a herbicidally active limonene component; from about 0.05% to about 10% w/w %, more preferably about 0.1% to about 0.5% w/w %, and more preferably from about 0.2% to about 0.4% by weight of an emulsifying agent; from about 0.02% to about 1.0% w/w %, more preferably about 0.05% to about 0.5% w/w %, and more preferably from about 0.1% to about 0.2% by weight of a wetting agent; and the balance of water or other selected hydrophilic solvent.
  • herbicide compositions comprising a herbicidally active limonene component at a concentration of at least about 8% w/w %, an emulsifying agent effective to dissolve or disperse the herbicidally active limonene component in water, in an effective amount, a wetting agent at a concentration of at least about 0.02% w/w % and a hydrophilic solvent, preferably water.
  • the herbicide composition includes a wetting agent effective to improve the wetting and penetration properties of the composition and has a pH greater than 5.
  • the herbicide composition, including a wetting agent has a pH from about 5 to about 10.
  • the pH is from about 6 to about 8, and in yet another embodiment, the pH is from about 8 to about 10.
  • wetting agents and pH modifiers that can be selected for use in connection with the invention include those described above as non-limiting examples.
  • herbicide compositions which are suitable for application as a spray, include about 8% to about 100% w/w %, more preferably about 12% to about 30% w/w %, and more preferably from about 15% to about 25% by weight of a herbicidally active limonene component; from about 0.05% to about 10% w/w %, more preferably about 0.1% to about 0.5% w/w %, and more preferably from about 0.2% to about 0.4% by weight of an emulsifying agent; from about 0.02% to about 1.0% w/w %, more preferably about 0.05% to about 0.5% w/w %, and more preferably from about 0.1% to about 0.2% by weight of a wetting agent; a pH modifier in an amount effective to maintain a pH greater than 5; and the balance of water or other selected hydrophilic solvent.
  • herbicide compositions comprising a herbicidally active limonene component at a concentration of at least about 8% w/w %, an emulsifying agent effective to dissolve or disperse the a herbicidally active limonene component in water, in an effective amount, a wetting agent at a concentration of at least about 0.02% w/w %; a pH modifier effective to maintain a pH greater than 5, and a hydrophilic solvent, preferably water.
  • the herbicide compositions of this invention can be prepared by entirely conventional procedures known to those of ordinary skill in the art.
  • the compositions can be made by preparing an aqueous mixture of the water, the emulsifying agent and the herbicidally active limonene component. The resulting mixture can then be agitated until a dispersion or emulsion is formed.
  • each non-aqueous component can be added serially into a container, with stirring, preferably for at least about 10 minutes after the addition of each component before adding the next component. After all of the non-aqueous components are mixed, the batch is agitated for another 10 minutes and the water can be mixed in to provide the herbicide composition. It can then be tested for quality control, filtered and filled into suitable containers for shipment, storage or immediate use.
  • inventive herbicides can be made, sold and shipped as ready-to-use solutions. It is understood, however, that an excellent manner of providing a herbicide composition to an end user is by first preparing a concentrate formulation that is then diluted with water or other hydrophilic solvent by the end user to provide a herbicide composition for application to target weeds or other vegetation.
  • herbicide compositions in accordance with the invention can be packaged as ready-to-use herbicides, or can be packaged as herbicide concentrate formulations. Where an inventive herbicide is to be used in a relatively small quantity, such as for home uses, the herbicide can be packaged in a conventional ready-to-use dispensing system.
  • the formulation includes a herbicidally active limonene component mixed with an emulsifying agent.
  • the formulation, along with a pH modifier, a wetting agent, or both are mixed with water or other hydrophilic solvent by the end user, for example, in a commercial sprayer.
  • the pH-buffering agent, the wetting agent, or both are pre-mixed with the herbicidally active limonene component and the emulsifying agent to provide a formulation that can be mixed directly with water or other hydrophilic solvent to provide a herbicide composition.
  • the herbicide formulation includes a herbicidally active limonene component mixed with an emulsifying agent, and is provided separately from the pH modifier, the wetting agent, or both.
  • emulsifying agent is to emulsify the herbicidally active limonene component with water
  • amount of emulsifying agent to include in a herbicide formulation or a herbicide composition is related to the amount of limonene in the formulation, irrespective of how diluted the limonene will be in the final herbicide composition.
  • the amount of emulsifying agent per unit limonene can remain unchanged.
  • the amount of pH modifier that would desirably be included in a herbicide composition can depend upon the volume and the initial pH of water mixed with the formulation; and the amount of wetting agent that would desirably be included in a herbicide composition is dependent upon the total volume of the herbicide composition. Therefore, the emulsifying agent can advantageously be mixed with the herbicidally active limonene component in a herbicide formulation, while the pH modifier and the wetting agent are desirably added at the time the herbicide formulation is mixed with water to provide the final herbicide composition.
  • herbicide formulations comprising a herbicidally active limonene component at a concentration of at least about 8% (w/w %), and an emulsifying agent at a concentration of from about 0.5% to about 10% (w/w %).
  • a herbicide formulation is provided that comprises a herbicidally active limonene component at a concentration of at least about 8% (w/w %), an emulsifying agent at a concentration of from about 0.5 to about 10% (w/w %), and a pH modifier in an amount effective to maintain the pH of the final herbicide composition above 5.
  • a herbicide formulation comprises a herbicidally active limonene component at a concentration of at least about 8% (w/w %), an emulsifying agent at a concentration of from about 0.5 to about 10% (w/w %), and a wetting agent at a concentration of from about 0.2% to about 10% (w/w %).
  • a herbicide formulation comprises a herbicidally active limonene component at a concentration of at least about 8% (w/w %), an emulsifying agent at a concentration of from about 0.5 to about 10% (w/w %), a wetting agent at a concentration of from about 0.2% to about 10% (w/w %); and a pH modifier in an amount effective to maintain the pH of the final herbicide composition above 5.
  • Said formulations can advantageously be mixed with water, and optionally one or more additional ingredients, at or near the location where the end user intends to apply the herbicide composition to plants.
  • the invention provides in one aspect a method for making a herbicide composition that includes providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; diluting the formulation with water to provide a herbicide composition; and mixing into the herbicide composition a pH modifier effective to provide a pH greater than 5 in the composition.
  • the invention provides a method for making a herbicide composition that includes providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; diluting the formulation with water to provide a herbicide composition; and mixing into the herbicide composition a wetting agent.
  • a method for making a herbicide composition that includes providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; diluting the formulation with water to provide a herbicide composition; and mixing into the herbicide composition a wetting agent and a pH modifier effective to provide a pH greater than 5.
  • the invention also provides a method for making a herbicide composition that includes providing a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5 in the formulation; diluting the formulation with water to provide a herbicide composition; and mixing into the herbicide composition a wetting agent.
  • kits for non-selective burn down of plants includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for diluting the formulation to provide a herbicide composition.
  • instructions for applying the herbicide composition to a pre-selected area for killing, controlling or suppressing plants growing in the area are also recorded in the medium.
  • a kit for non-selective burn down of plants includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; and instructions, recorded in a medium, for diluting the formulation with water and adding a pH modifier effective to provide a pH greater than 5.
  • a kit for non-selective burn down of plants that includes a container having therein a liquid herbicide, the herbicide including water, a herbicidally active limonene component, an emulsifying agent and a wetting agent; and instructions for applying the herbicide to a pre-selected area for killing, controlling or suppressing weeds or other plants in the area.
  • kits for non-selective burn down of plants that includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; and instructions, recorded in a medium, for diluting the formulation and mixing in a wetting agent to provide a herbicide composition.
  • instructions for applying the herbicide composition to a pre-selected area for killing, controlling or suppressing plants growing in the area are also recorded in the medium.
  • a kit for non-selective burn down of plants includes a container having therein a liquid herbicide, the herbicide including water, a herbicidally active limonene component, an emulsifying agent, a wetting agent and a pH modifier effective to provide a pH greater than 5; and instructions for applying the herbicide to a pre-selected area for indiscriminately killing plants growing in the area.
  • kits for non-selective burn down of plants includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component, an emulsifying agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for diluting the formulation and adding a wetting agent to provide a herbicide composition.
  • Still another embodiment of the invention is a kit for non-selective burn down of plants that includes a container having therein a liquid herbicide formulation, the herbicide formulation including a herbicidally active limonene component and an emulsifying agent; and instructions, recorded in a medium, for diluting the formulation with water and adding a wetting agent and a pH modifier effective to provide a pH greater than 5.
  • kits for non-selective burn down of plants includes a container having therein a liquid herbicide, the herbicide including water, a herbicidally active limonene component, an emulsifying agent and one or more member selected from a wetting agent and a pH modifier effective to provide a pH greater than 5; and instructions, recorded in a medium, for applying the herbicide to a pre-selected area for indiscriminately killing plants growing in the area.
  • inventive herbicide composition or herbicide concentrate formulation in accordance with the invention can be prepared to include a variety of other beneficial ingredients in addition to the ingredients discussed above.
  • beneficial it is meant that the additional ingredient provides some additional functionality, efficacy, quality or other desirable attribute the herbicide or herbicide concentrate.
  • the herbicidally active limonene component may be blended with other, cheaper, and somewhat less volatile oils to form effective herbicides.
  • One or more other ingredients may optionally be included in the compositions of the invention in order to provide aesthetic or other beneficial properties thereto.
  • Such optional ingredients are, for example, antimicrobial agents, preservatives, deodorizers, coloring agents, fragrances, additional emulsifiers, additional solubilizers, corrosion inhibitors and additional solvents.
  • antimicrobial agents for example, antimicrobial agents, preservatives, deodorizers, coloring agents, fragrances, additional emulsifiers, additional solubilizers, corrosion inhibitors and additional solvents.
  • additional emulsifiers additional solubilizers
  • corrosion inhibitors and additional solvents.
  • optional ingredients that can be incorporated include the following: an antimicrobial, such as, for example, phenolic compounds such as o-phenylphenol and o-benzyl[p-chlorophenol]; quaternary ammonium compounds such as alkyl dimethyl benzyl ammonium chloride, octyl decyl dimethyl ammonium chloride, dioctyl dimethyl ammonium chloride, didecyl dimethyl ammonium chloride and alkyl dimethyl benzyl ammonium saccharinate; a deodorizer, such as, for example, N-alkyl-N-ethylmorpholinium ethyl sulfate; and a corrosion inhibitor, such as, for example, mono- and triethanolamine, ammonium hydroxide, sodium molybdate, sodium benzoate and tetra sodium ethylenediamine tetraacetate.
  • an antimicrobial such as, for example, phenolic compounds such as o-phenylphenol
  • phenolic and quaternary ammonium antimicrobial agents generally will not exceed a concentration of about 0.2 percent by weight in the final herbicide composition.
  • a preservative be added to the composition.
  • a preservative is sodium benzoate commercially supplied by Pfizer, Inc.
  • the invention provides a method for killing, controlling or suppressing unwanted plant growth, wherein a herbicide composition provided in accordance with the present invention is applied to the unwanted plant or plants.
  • the composition is then permitted to remain in contact with the plant, preferably the leaves of the plant, for a period of time sufficient to kill, control or suppress the plant.
  • the time required for effective treatment of a given plant is dependent upon a variety of factors including, but not limited to concentration, spray coverage, pH of the herbicide solution, the species of the plant, the size/age/maturity of the plant, the availability of leaf surfaces or other green surfaces, and ambient conditions.
  • the method includes spraying the herbicide on the area at a rate of from about 5 gal/acre to about 40 gal/acre. In another preferred manner of practicing the invention, the method includes spraying the herbicide on the area at a rate of from about 5 gal/acre to about 35 gal/acre.
  • spray applications on weeds are typically susceptible to runoff.
  • the equivalent spray volume per acre could be from a couple of quarts to 100 gallons per acre or more.
  • a herbicide formulation (MM-01) was prepared in accordance with the invention to include 94.0 w/w % limonene with the following emulsifiers: 1.3 w/w % TergitolTM NP-8 (nonylphenol ethoxylate surfactant), 2.0 w/w % TergitolTM NP-9 (nonoxynol 9.5 surfactant) and 2.7 w/w % Pluracol® P-425 (polypropylene glycol surfactant).
  • the resulting formulation contains 88% limonene w/w %.
  • each component is added one by one and the mixture is stirred for 10 minutes after each addition and before adding the next component, to ensure complete and homogeneous blending of the components. After all the components are mixed, the batch is agitated for another 10 minutes, tested for quality control, filtered and filled into suitable containers.
  • the formulation was diluted with water to a 3:1 ratio by volume, represented as water:herbicide formulation ratio, to provide a herbicide composition (22% limonene w/w %). It is estimated that the pH of the 3:1 ratio composition was 4.5. The pH was lowered to 4 with lemon juice in a first test batch and raised to pH 9 with potassium carbonate in a second test batch. In addition, a herbicide composition with the 3:1 ratio was modified by adding 0.05% silicone based surfactant (Silwet) in a third test batch.
  • silicone based surfactant Silwet
  • Color and wilting ratings were taken at 2 hours, 1 day, 2 days, and 7 days after treatment. Data collected for the test compositions were compared to an untreated control (UTC) and an area of vegetation treated with Paraquat (Gramoxone®). This trial contained 3 reps per treatment (except the paraquat treatment which was a single strip). Treatments were randomly distributed within a rep. Color and wilting ratings were taken at 2 hours, 1 day, 2 days and 7 days after treatment. Results are set forth in FIGS. 1-6 .
  • Example 2 A field trial was conducted in Zellwood, Fla. The same formulation described in Example 1 was used in the Florida trial. All limonene treatments were made at a 3:1 ratio by volume, represented as water:herbicide formulation ratio, to provide a herbicide composition of 22% limonene (w/w %). Four reps per treatment were used; all treatments were randomly distributed within a rep. The weed species was common lambsquarters (1 to 2 feet in height). Treatments applied were pH 3, 7, 8 and 9 with and without a silicone surfactant, Silwet; each treatment was sprayed until runoff. The commercial burn down standard, Gramoxone (paraquat) was included. Readings were taken at 1 and 2 hours, and 1, 3 and 7 days.
  • Example 2 The same formulation described in Example 1 was used in the MSU greenhouse trials. Four reps per treatment were used. All limonene treatments were made at a 3:1 ratio by volume, represented as water:herbicide formulation ratio, to provide a herbicide composition of 22% limonene (w/w %).
  • the herbicide composition was applied in spray chamber designed to mimic an agricultural application. Spray volume was 60 gallons per acre and the spray nozzle pressure was 40 psi. The weed species was common lambsquarters (1 to 2 feet in height). Treatments applied were pH 3, 5, 7, 8 and 9 without any surfactant. A single reading was taken at day 4. Results are set forth in FIG. 8 .
  • pH 7 and 8 had numerically better responses than pH 3 (11.4% and 7.5% respectively) or unadjusted limonene at pH 4.2 (14.7% and 10.6% respectively). pH 9 was significantly lower than the other treatments.

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US11/071,398 US20060199739A1 (en) 2005-03-02 2005-03-02 Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same
PL06736701T PL1855527T3 (pl) 2005-03-02 2006-03-02 Kompozycje chwastobójcze zawierające limonen
HUE06736701A HUE038053T2 (hu) 2005-03-02 2006-03-02 Limonén-tartalmú herbicid készítmények
JP2007558219A JP5385534B2 (ja) 2005-03-02 2006-03-02 リモネン含有除草剤組成物、除草剤原液配合物ならびにそれらを製造および使用する方法
EP17001360.1A EP3266304A1 (en) 2005-03-02 2006-03-02 Limonene-containing herbicide compositions
EP06736701.1A EP1855527B1 (en) 2005-03-02 2006-03-02 Limonene-containing herbicide compositions
MX2007010700A MX2007010700A (es) 2005-03-02 2006-03-02 Composiciones de herbicidas que contienen limoneno, formulaciones de concentrados de herbicidas y metodos para fabricar y usar las mismas.
LTEP06736701.1T LT1855527T (lt) 2005-03-02 2006-03-02 Limoneno turinčios herbicidų kompozicijos
CA2600605A CA2600605C (en) 2005-03-02 2006-03-02 Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same
PT67367011T PT1855527T (pt) 2005-03-02 2006-03-02 Composições herbicidas que contêm limoneno
SI200632210T SI1855527T1 (sl) 2005-03-02 2006-03-02 Limonen vsebujoči herbicidni sestavki
PCT/US2006/007426 WO2006094126A2 (en) 2005-03-02 2006-03-02 Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same
ES06736701.1T ES2643894T3 (es) 2005-03-02 2006-03-02 Composiciones herbicidas que contienen limoneno
DK06736701.1T DK1855527T3 (en) 2005-03-02 2006-03-02 LIMONEN-CONTAINING HERBICIDE COMPOSITIONS
US11/556,287 US8153561B2 (en) 2005-03-02 2006-11-03 Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same for organic production
US11/733,572 US20080004183A1 (en) 2005-03-02 2007-04-10 Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same
CR9360A CR9360A (es) 2005-03-02 2007-08-31 Composiciones de herbicidas que contienen limoneno, formulaciones de concentrados de herbicidas y metodos para fabricar y usar las mismas.
US12/776,610 US8273687B2 (en) 2005-03-02 2010-05-10 Limonene-containing herbicide compositions, herbicide concentrate formulations and methods for making and using same
CY20171101080T CY1119467T1 (el) 2005-03-02 2017-10-16 Ζιζανιοκτονες συνθεσεις που περιεχουν λιμονενιο

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